Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-11-04
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
To appear in UP:Have Observations Revealed a Variable Upper End of the Initial Mass Function? ASP Conference Series ed: M.Trey
Scientific paper
We present a new method to analyze the IMF at its high mass end in young stellar clusters, which rely on two integrated observables: the cluster bolometric and Halpha luminosity. Using several cluster samples selected in M33 we show that a stochastically sampled universal IMF is in better agreement with the data than a truncated IMF whose maximum stellar mass depends on cluster mass. We also discuss the possibility that a delayed formation of massive stars is taking place in low density star forming regions as an alternative to a strong leakage of ionizing photons from HII regions of young luminous clusters.
Corbelli Edvige
Giovanardi Carlo
Grossi Marco
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